drm/amd/display: No need for Null pointer check before kfree

kfree() & vfree() internally performs NULL check on the pointer handed
to it and take no action if it indeed is NULL. Hence there is no need
for a pre-check of the memory pointer before handing it to
kfree()/vfree().

Issue reported by ifnullfree.cocci Coccinelle semantic patch script.
Reviewed-by: NRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: NDeepak R Varma <drv@mailo.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn30/dcn30_clk_mgr.c

@@ -577,8 +577,7 @@ void dcn3_clk_mgr_construct(
 
 void dcn3_clk_mgr_destroy(struct clk_mgr_internal *clk_mgr)
 {
-	if (clk_mgr->base.bw_params)
-		kfree(clk_mgr->base.bw_params);
+	kfree(clk_mgr->base.bw_params);
 
 	if (clk_mgr->wm_range_table)
 		dm_helpers_free_gpu_mem(clk_mgr->base.ctx, DC_MEM_ALLOC_TYPE_GART,

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c

@@ -783,8 +783,7 @@ void dcn32_clk_mgr_construct(
 
 void dcn32_clk_mgr_destroy(struct clk_mgr_internal *clk_mgr)
 {
-	if (clk_mgr->base.bw_params)
-		kfree(clk_mgr->base.bw_params);
+	kfree(clk_mgr->base.bw_params);
 
 	if (clk_mgr->wm_range_table)
 		dm_helpers_free_gpu_mem(clk_mgr->base.ctx, DC_MEM_ALLOC_TYPE_GART,